79+80+84_rx-7

okay... as I have been reading... certain types of ports make different type of power at certain rpms....


so lets say... I have a motor with stock ported center plate..... large street ported outter plate.... PP housings... and race cut exhaust ports....

technically.. couldnt you make an EFI intake that at certain rpms, only the primarys get air/fuel, then when that power band kicks out... or when the secondaries are cut to enter, cant you make that throttle plate open, and then when it gets the revs high enough, the PP can take over?!?!?!?


So its electronically controlled throttle plates... and there is like 3 differnt ones... the smallest for the stock port center plate... the medium sized one for the street ported outter plates... and the biggest one for the PP ports....


And it all be controlled and tuned through a satnd alone or along with?


That would be AWESOME power band.....

Sounds feasible too.. just pricey....



Any input appriciated...

The_7

thats an awesome idea, only prob would be money. streetports still have decent low end so what if the center AND outer plate were streetported and there was an adjustable plate that changed the port size/overlap at different rpms (like the 13B) and then at extremely high rpms the pp housings and streetports would run together?

Rx7carl

I like your idea. But its kinda complicated to keep control over. Why not do something sililar to what Mazda used in the 787B car? That TIMS setup would be easier I think to make.

79+80+84_rx-7

I wasnt planning on trying it... just food for thought..



explain that tims system!

Thanks, Laterz, Andrew

inittab

Here ya go...
http://www.mymazdarotary.com/mazda_r...paper_html.htm

79+80+84_rx-7

give me a simple explanation... dont have the patience to read all that....

inittab

IT... MAKE ... CAR ... GO ... FAST!

There, how's that?

79+80+84_rx-7

rotarygod

iTrader: (1)

It is a great idea and would work very well provided that everything else is designed properly. Just do a streetport on the primaries so you can retain the stock fuel injector mounts. Completely fill in the secondary ports. Cut new peripheral ports but only make them as large around as the secondary intake runners. This would be somewhere on the order of 1 5/8"- 1 3/4" or so. Choose where you want your powerband to be and design an intake manifold that has runner lengths that peak it there. This part is very easy. Use a rotating valve like the VDI actuator and modify it to close off the peripheral ports below a certain rpm. Port the exhaust, get a good collected exhaust system on it (duals don't work well with p-ports), get a standalone ecu and your done. An engine with great low end that will probably pass an emissions test and idle good and after a certain rpm just pulls like crazy. Its the same basic design principle that is now being used in the Renesis engine (the actuated runners not the p-ports). You wouldn't want a very big p-port since intake air velocity will really start to suffer. You also under no circumstances what so ever would want to use a stock intake manifold. This style engine would work very well and it is something that I have thought about doing for a long time. I just have so many hobbies and so little time.

Kenku

That's... pretty much what I'm planning to do to my 13B. Only sticking point is the standalone; don't have the money for that right now.

... oh, and the fact that the race car keeps breaking in new and interesting ways.

Rx7carl

Simply put, they used a variable length intake to keep it tuned from low to top end Rpm's.

Directfreak

iTrader: (2)

Semi-Peripheral Port Turbo engine.

RotorMotorDriver

iTrader: (1)

So its been done...Hmm, interesting. Way to go DF, as usual .

~T.J.